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Topic: So I made the jump to FF - now what? (Read 17646 times)

Among the zooms you mention I used to own the 70-300 IS and now own the 70-200 f/4 IS L and 70-300 L. Perhaps I had an unusually good copy of the 70-300 IS but while the 70-300 L does provide superior images, the superiority isn't glaringly obvious, and I bet it's far superior to your Tamron ultra-zoom at any length where they overlap. The 70-300 L is, however, plainly superior from a purely mechanical point of view - it's quite superbly made, has excellent stabilization and on my 6D never hunts for focus unless it's so dark I can hardly see what I'm trying to focus on, and even then it usually gets it right. The 70-200 f/4 IS is superb too, but I don't think I've used mine since I bought the 70-300, largely because I use the 70-300 at 300 a lot for background blur - 300 does that better than 200. Coming from APS-C, depending on how you used your Tamron superzoom you may well find yourself limited by a 70-200. If you doubt you'll want to go beyond 200mm, toss a coin between those two.

(I've only rented the 100-400, and maybe the copy I rented wasn't a particularly good one, but it didn't seem quite as good to me - mechanically or otherwise - as the 70-200 f/4 IS or 70-300 L, and I actively disliked the fussy bokeh it conjured up on busy detail fairly close to the subject.)

It all depends on what you want to do with it. All the lenses you list are very good all-purpose lenses. If you have anything more specific in mind there may be alternatives.

Somebody mentioned it already but I would always start with a 135L for the longer end before buying expensive big fast heavy zoom lenses - or settle on a lighter and cheaper f/4 lens. But again that all depends on use and preferences.